/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package Controller;

import Model.Dto.UserAccount;
import Model.UserAccountModel;
import Common.Constants;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Quang Nhat
 */
public class Login extends HttpServlet {

    public static final String HOME_PAGE = "index.jsp";

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            String action = request.getParameter("btnAction");
            if ("Logout".equalsIgnoreCase(action)) {
                HttpSession session = request.getSession(false);
                if (session != null) {
                    session.removeAttribute(Constants.SESSION_USER);
                    response.sendRedirect(HOME_PAGE);
                }
                return;
            }
            /* TODO output your page here. You may use following sample code. */
            String username = request.getParameter("txtUsername");
            String password = request.getParameter("txtPassword");
            String returnUrl = request.getParameter("returnUrl");
            String queryString = request.getParameter("queryString");
            UserAccount acc = UserAccountModel.getUserAccount(username, password);
            if (acc != null) {
                HttpSession session = request.getSession(true);
                session.setAttribute(Constants.SESSION_USER, acc);
                if (returnUrl == null) {
                    returnUrl = HOME_PAGE;
                }
                response.sendRedirect(returnUrl + "?" + queryString);
                return;
            }
            response.sendRedirect("InvalidUser.jsp");
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
